12-15 seconds.
True
Two seconds.
Highly variable, but in inclement conditions at higher speeds a pro would be looking 20-30 seconds ahead a lot I think the book answer is at least ten..
According to the Smith System safe driving course. You should look ahead at least 15 seconds.
You follow the vehicle ahead of you by 3 seconds, you should never plan a path where you will be unless you are switching lanes and need to know how much space you have because while driving things can change in an instant, for good defensive driving just be prepared for anything at any time, and always follow vehicles by 3 seconds from the time their rear bumper passes an object until your front bumper passes the same stationary object
It depends on how fast your reflexes are, at a velocity of 176 feet per second (1 mile per minute), if your reflex reaction time is 2 seconds you need to look at least 352 feet ahead, if your reaction time is 3 seconds, then you should be looking at least 528 feet ahead.
When driving, you should always measure your following distance in seconds. A general rule of thumb is to maintain a following distance of at least 3-4 seconds between your vehicle and the one in front of you. This distance allows you enough time to react and brake safely in case of an emergency.
a good rule of thumb, is to back off at least 1 car for every 10 miles per hour that your driving. this way, if theres a problem up ahead. you will have time to try and stop.
You should keep at least a three second distance to the car ahead.
The recommended space between two vehicles should be at least three seconds under ideal driving conditions. This allows sufficient time to react to sudden stops or emergencies. In adverse weather conditions or when driving at higher speeds, increasing the following distance to four or more seconds is advisable for safety. Always adjust the distance based on road and traffic conditions.
You should allow at least 4 seconds of following distance when driving a 30-foot vehicle at 55 mph. This provides enough time to react to any sudden changes in traffic ahead and helps prevent rear-end collisions.
4 to 5 seconds